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 | Access 4.x | Digital inputs | 
Configuration > I/O allocation settings > Digital inputs >
| Digital input | Description | 
| Feedback supply air fan | Triggers alarm 1: Malfunction supply air fan 1 | 
| Feedback extract air fan | Triggers alarm 6: Malfunction extract air fan 1 | 
| Alarm extra fan motor 1 | Triggers alarm 40: Malfunction extra fan motor 1 | 
| Alarm extra fan motor 2 | Triggers alarm 41: Malfunction extra fan motor 2 | 
| Start/(Stop) extra fan motor 1 | Start/stop signal for fan if Configuration > Functions > Extra fan motor control > Start/Stop function fan motor 1 (2) > "Digital input" | 
| Start/(Stop) extra fan motor 2 | |
| Extended operation low speed | Manual control: low speed | 
| Extended operation normal speed | Manual control: normal speed | 
| Extended operation high speed | Manual control: high speed | 
| External stop | Manual stop | 
| Fire alarm | N/A | 
| Smoke sensor alarm | Triggers alarm 59: Smoke alarm | 
| External alarm | N/A | 
| Fire damper position switch | Fire damper end switch for functioning testing | 
| Feedback SEQ-A | Triggers alarm 43: Malfunction heating (SEQ-A) | 
| Feedback SEQ-B | Triggers alarm 44: Malfunction exchanger (SEQ-B) | 
| Feedback SEQ-C | Triggers alarm 45: Malfunction cooling (SEQ-C) | 
| Feedback SEQ-D | Triggers alarm 46: Malfunction recirculation 1 (SEQ-D) | 
| Feedback SEQ-E | Triggers alarm 47: Malfunction recirculation 2 (SEQ-E) | 
| Feedback SEQ-F | Triggers alarm 48: Malfunction fan setpoint comp (SEQ-F) | 
| Feedback SEQ-G | Triggers alarm 49: Malfunction heating 2 (SEQ-G) | 
| Feedback SEQ-H | Triggers alarm 50: Malfunction cooling 2 (SEQ-H) | 
| Feedback SEQ-I | Triggers alarm 51: Malfunction exchanger extract (SEQ-I) | 
| Feedback SEQ-J | Triggers alarm 52: Malfunction external heating/cooling (SEQ-J) | 
| Alarm acknowledgment | N/A | 
| Flow guard | Triggers alarm 55: Alarm low air flow | 
| Defrost switch | N/A | 
| Recirculation operation | N/A | 
| Cooling/(heating) changeover 1 | N/A | 
| Cooling/(Heating) changeover 2 | N/A | 
| Rotary exchanger alarm | N/A | 
| Frost protection switch | N/A | 
| Overheated electric heater | N/A | 
| Filter guard supply air | N/A | 
| Filter guard extract air | N/A | 
| Extra alarm 1 | Undefined inputs for external alarms. Alarm name and action can be set. | 
| Extra alarm 2 | |
| Extra alarm 3 | |
| Extra alarm 4 | |
| Extra alarm 5 | |
| Extra alarm 6 | |
| Extra alarm 7 | |
| Extra alarm 8 | |
| Extra alarm 9 | |
| Extra alarm 10 | |
| Lock PID controller supply | Lock supply air temperature controller | 
| Summer/(winter) mode | N/A | 
